| Abstract:In response to issues such as low efficiency of traditional straw returning, susceptibility to pests and diseases, and constraints on the promotion of acetic acid pulping technology due to the recycling of waste liquid, this study utilized waste liquid (degradation liquid) from acetic acid pulping of corn straw. Through pot experiments, the effects of different concentrations (diluted 25-200 times) of the degradation liquid on soil physicochemical properties, enzyme activity, and leafy vegetable growth were investigated. The results showed that the degradation liquid contained various components such as sugars and small molecular organic acids. Application of the degradation liquid increased soil organic matter content, decreased pH, increased electrical conductivity, and enhanced sucrase and phosphatase activities. When the dilution factor exceeded 100 times, soil bulk density decreased, soil moisture content increased, while urease and catalase activities decreased. Ammonium nitrogen content increased when the dilution factor exceeded 50 times. Total phosphorus and available phosphorus content increased when the dilution factor exceeded 100 times. Degradation liquid diluted 50-200 times promoted plant growth, with the best growth observed at a 100-fold dilution. The full component of corn straw acetic acid pulping waste liquid can be used for soil improvement. Appropriate concentrations of the degradation liquid can enhance soil physical properties, chemical fertility, and biological fertility, promote crop growth, and advance the technology of acetic acid pulping. |